#include <bits/stdc++.h>
using namespace std;
typedef long long ll;


int main() {
  string s;
  cin >> s;
  sort(s.begin(), s.end());

  int mi = s[0];
  int pos = -1;
  for (int i = 1; i < s.size(); ++i) {
    if (s[i] != mi) {
      pos = i;
      break;
    }
  }

  if (pos == -1) {
    puts("-1");
    return 0;
  }

  swap(s[0], s[pos]);
  reverse(s.begin(), s.end());
  if (s[0] == '0') {
    puts("-1");
  } else {
    cout << s << '\n';
  }
  return 0;
}